Ratna

gs

GPL Ghostscript 9.25 (2018-09-13)
Copyright (C) 2018 Artifex Software, Inc. All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
GS>

I didn't test the PDF annotation in MoodleBox yet. I have seen that never Moodle versions use a whole lot of programs like unconv and others from OpenOffice. And also there are broken PDFs. May be you could start at the other end. Upload a PDF to MoodleBox which is known to be "annotatable" in another Moodle and go from there.

AlexN

Thanks Nicolas. It worked.

Every other instruction I found online only mentioned sudo apt-get install ghostscript -y but I guess it doesn't work without sudo apt-get update being run first.